Convertible piano stool and chair



2 SheetsSheet' 1.

(No Model.)

L. H. 8: G. G. ROBY. CONVERTIBLE PIANO STOOL AND CHAIR.

No. 602,773. Patented Apr, 19. 1898.

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(No Model.) 2 Sheets-Sheet 2.

L. H. 8; G. G. ROBY. CONVERTIBLE PIANO STOOL AND CHAIR.

No. 602,773. Patented Apr. 19, 1898.

ATENT LEROY HALL ROBY AND GILES CARL ROBY, OF FOSTORIA, OHIO.

CONVERTIBLE PIANO STOOL AND CHAIR.

SPECIFICATION forming part of Letters Patent No. 602,773, dated April19, 1898.

Application filed September 20, 1897. Serial No. 652,307- (No model.)

To aZZ whom it may concern:

Be it known that we, LEROY HALL ROBY and GILES CARL ROBY, citizens ofthe United States, residing at Fostoria, in the county of Seneca andState of Ohio, have in vented a new and useful Convertible Piano Stooland Chair, of which the following is a specification.

Our invention relates to improvements in convertible piano stools andchairs; and the object that we have in view is to provide a structure inwhich the elements may be adjusted to form a chair to be used bya personperforming at a piano or as a stool to accommodate two persons playing aduet at a piano.

A further object of the invention is to provide an adjustable seat whichmay be raised to accommodate persons of different heights, saidvertical] y-adjustable seat being held or locked securely in either itsraised or lowered position.

A further object of the invention is to provide improved means forraising or lowering the seat-frame without rotating the same andincurring the liability of striking and injuring the piano.

A further object of the invention is to improve the convertible stooland chair in minor details with a view to simplifying its construction,promoting ease and facility of adjustment, and making it strong anddurable in service.

Vfith these ends in view the first part of our invention consists in thecombination, with a base and a standard, of a sectional seat-frame, thebase member of which is rotatably mounted on the standard, while theother member of said seat frame is sildable horizontally on the basemember for the purpose of making the seat-frame extensiblelongitudinally, a back connected to the slidable member of theseat-frame and adapted to be raised or lowered. to occupy positionseither at right angles to the seat-frame or in substantially the samehorizontal plane therewith, and means for holding the slidable member ofthe seat-frame and the adjustable back rigidly in either of theiradjusted positions; and the invention further consists in the novelcombination of elements and in the construction and arrangement ofparts, which will be hereinafter more fully described and claimed.

To enable others to understand our invention, we have illustrated thepreferred embodiment thereof in the accompanying drawings, forming apart of this specification, and in which Figure 1 is a perspective viewshowing our invention adjusted for service as a chair. Fig. 2 is avertical central sectional view of the chair and stool in the positionshown by Fig. 1. Fig. 3 is a similar sectional view with the structureadjusted to form a stool on which two persons may sit when playing onthe piano. Fig. 4 is a sectional plan view on the plane indicated by thedotted line 4 at of Fig. 2. Fig. 5 is a horizontal sectional view 011the plane indicated by the dotted line 5 5 of Fig. 2. Fig. 6 is ahorizontal sectional view through the vertically-adj ustable seat on theplane indicated by the dotted line 6 6 of Fig. 3,1ooking in thedirection indicated by the arrow. Fig. 7 is a detail view of the linkswhich connect the adjustable back with the sliding section of theseat-frame. Fig. 8 is a detail perspective View of one of the slottedplates attached to the seat for the seat-lock to engage therewith. Fig.9 is a vertical transverse view on the plane indicated by the dot tedline 9 9 to show the locking device for holding the members of theseat-frame in fixed position in relation one with the other.

Like numerals of reference denote like and corresponding parts in eachof the several figures of the drawings.

Referring by numeral to the drawings, 1 designates a base having thediverging legs 2,

a vertical socket 3, and the reinforcementplate 3. This socket is ofangular form in cross-section and it is closed at its lower end by arigid or integral head 4:, said head form ing a seat for the coiledlifting-spring 5, which is loosely fitted in the angular socket of thebase.

6 is a vertically-adj ustable standard fitting snugly in the angularsocket of the base. This standard is substantially square incrosssection to conform to the cross-sectional contour of the socket, inorder that the standard may fit in the socket andbe kept from rotatingin a horizontal plane therein; but at the same time the standard is freeto slide vertically in the socket to sustain the seat at the desiredelevation. This vertically -adjustable and non-rotatable standard isarranged to rest or seat itself upon the coiled liftingspring 5, thelatter having a tendency to normally raise the standard and theseat-support thereon; but the tendency of the lifting-spring is overcomeby means of the locking-pawls S,

' which are controlled by the levers 9, operalively connected to anadjusting-ratchet 10.

The angular standard is provided in two opposite faces with longitudinalchannels 11, that extend, practically, from the lower to the upper endsof the standard, and the other two faces of the angular standard areprovided with the short longitudinal channels 12. In the shortlongitudinal channels are fitted the locking-pawls 8. Each lockingpawlconsists of a plate,.which is pivotally attached at its upper end to thestandard by bolts or pins 8, so that the upper ends of the pawls arepractically flush with the faces of the standard. The lower ends of thepawls have teeth or serrations 8 formed thereon, and against these lowertoothed ends of the pawls bear the pressure-sprin gs 13, which arefitted and housed within sockets 13, provided in the standard near thelower end thereof. These springs normally press the lower serrated endsof the pivoted pawls outwardly beyond the faces of the standard; but thepawls may be retracted by the levers 9 and the adjusting-ratchet 10, sothat the lower serrated faces of the pawls may lie practically flushwith the standard and permit the latter to be raised or lowered by handvertically within the socket of the base. Said pawls are provided withangular arms let, that fit around the corners or angles of the standardand are housed within transverse channels or grooves 11 in the standard.The levers 9 are arranged longitudinally within the long channels11 inthe standard, and each lever isfulcrumed at a point intermediate of itslength on a pin or screw 9, which is fastened in the standard. The lowerends of the leversare attached pivotally to the angular arms 14 of thepawls, as at 14:, and the upper ends of said levers are pivotallyattached to the adjusting-ratchet 10 by providing tenons on said upperends of the levers, which tenons pass through apertures in the adjmisting-ratchet at diametrically opposite points therein. This ad jlisting-ratchet fits looselyaround the upper end of the standard 6, andsaid ratchet: has a transverse web 10, which is integral This transverseweb of the with the ratchet. ratchet passes through a notch or recess 6,formed in the upper extremity of the standard, and in said web is formeda central a perture, through which passes a vertical spindle 15. througha central bore or passage 15, provided in the standard 6, and on thelower end of said spindle is fitted a washer 17 and a nut 18, the latterbeing screwed on the threaded lower extremity of the spindle to clampthe spindle rigidly within the standard. The upper part of this spindlepasses through the This spindle extends longitudinallyfi apertureprovided with the web 10 of the adjusting-ratchet, and it is extendedthrough a casting 19 and a pivot-block 20, provided in the base-sectionof the sectional seat-frame. The casting 19 is constructed forattachment to the upper end of the standard 6 and to serve as a supportfor the seat-frame to enable the latter to rotate freely in a horizontalplane on the standard. This casting consists of a clip 19 and ahead-plate 19 The head plate is disposed in the horizontal position,while the clip depends from the lower side of the head-plate. This clipembraces opposite sides of the standard at the upper end thereof, and itis fastened rigidly to the standard by screws or any other suitablefastening means. The head-plate 19 of the casting fits closely againstthe lower side of the seat-frame, and upon this head-plate bears thepivot-block 20, which is attached to the seat-frame and forms a metallicbearing for the upper extremityof the spindle 15.

The adjusting-ratchet 1O fits compactly with relation to the head-plateof the casting 19, and said ratchet is provided with a series of radialnotches forming a plurality of teeth, with which may be engaged a prong22 of an adjusting-lever 21. This adjusting-lever is curved or bent,substantiallyas shown by Fig. 4 of the drawings, and said lever isfulcrumed at a point intermediate of its length, as at 23, on thecentral bridge-bar of the base member forming a part of the seat-frame.The prong 22 of the adjusting-lever depends from the lower side of theseat-frame, and it lies close to the radially notched or toothed edge ofthe adj Listing-ratchet, so that when the lever is turned in ahorizontal direction the prong 22 will engage with one of the notches orteeth of the adjusting-ratchet for the purpose of turning the latter asufficient distance to move the levers 9 and retract the locking-pawls 8within the channeled standard.

One end of the adjusting-lever 21 is provided with a handpiece, asshown, arranged to extend from one side of the seat-frame, and thishandle of the lever works in a keeper 24, fastened to the lower side ofthe seat-frame, near one edge thereof, to hold the lever in properrelation and permit it to have the necessary horizontal movement tothrow its prong 22 into and out of engagement with theadjusting-ratchet, and to this adj usting-lever is connected aretracting-spring 25, one end of which is attached to the seat-frame andthe other end to the adjusting-lever, so as to hold the latter inposition for its prong 22 to clear the adjusting-ratchet.

The standard 6 is adjusted in the socket of the base to have itsholding-pawls 8 lie opposite to serrated or toothed plates 26. The ser-IIO serrated ends of the pawls 8 to engage therewith when the said pawlshave their free ends forced or projected outwardly by the tension oftheir pressure-springs.

From the foregoing description it will be apparent that the standard maybe held in a locked position at any desired elevation by the pawls 8engaging with the serrated plates 26 in the socket of the base. Thestandard is adjustable vertically within the base without rotating thestandard therein; but before the standard can be raised or lowered thead j usting-lever 21 must be moved to turn the adj listing-ratchet 10 alimited distance sufficient to move the levers 9 and retract the pawls8, whereby the pawls are free from engagement with the serrated plates26, and the standard may be raised or lowered vertically within thebase. When the. adjusting-lever 21 is released, it is retracted by itsspring 25 to release its prong 22 from the adj listing-ratchet, and thepawls are thus freed from restraint by the levers 9, so that the springs13 force the pawls outwardly and permit the serrated ends of the pawlsto engage with the serrated plates and hold the standard rigidly inplace. The seat-frame is adjustable vertically with the standard; butthis seat-frame is also capable of a free turning movement in ahorizontal plane by reason of the seat-frame resting upon the head-plateof the casting 19 and having its pivot-block 20 looselyfitted to theupper extremity of the vertical spindle 15.

3O designates the seat-frame. It consists of a base member 31 and aslidable member The slidable member is arranged to fit loosely withinand upon the base member, so as to move horizontally and longitudinallytherein to make the seat-frame extensible. The seat-frame has its basemember constructed witha central bridge-bar 33, the ends of which areunited rigidly to end bars of the base member 31, and which bridge-barforms a support for the cross-bars of the slidable member 32. The backof the chair is indicated at 34, and this back is provided with shortposts 35, which are hinged or pivotally attached at 36 to the rear railof the slidable member of the seat-frame. This hinged back is adjustablyattached to the slidable member of the seat-frame for the purpose oflowering the back when the slidable member is extended lengthwise of theseat-frame; but when the back is raised to an upright position theslidable member of the seat-frame is retracted in the base memberthereof. When the back is raised and the slidable member of theseat-frame retracted,the strucj ustment of the back and sliding seatmember is effected simultaneously by means of the links 37. These linksare curved throughout their length to enable the front ends thereof tobe attached to the slidable member of the seat-frame, while the otherends of the links are loosely attached to the rear side of the hingedback 34. The links pass loosely through slots in angular brackets 31which are fastened rigidly to the back rail of the base member 31 of theseat-frame. As shown by the drawings, we prefer to make these links froma single rod or bar of metal, which is bent at its middle to form thepintle bar 38 and afterward bent to form the parallel links, said linksbeing curved, as described and as illustrated by the drawings. Thepintle-bar 38 of the links is loosely fitted in a loop or keeper 39,fastened to the rear rail of the sliding member of the seat-frame, andthe rear ends of said links are provided with T-shaped heads 40, whichare fitted in slots 41, provided in longitudinal rails forming a part ofthe frame of the back 34. Wearplates 42 are fastened to the back-rails,and said wear-plates have longitudinal slots which are coincident withthe slots in the backrails. Said links are also provided withlaterally-extending lugs 43, arranged to bear against the wear-plates 42and to assist in sustaining the back when it is lowered to itshorizontal position to form one of the seatsof the stool. The centralbridge-bar 33 of the base member of the frame is provided in itsopposite edges with diagonal grooves or channels 44, the edges of whichform the inclines or cams 45 and 46, and the upwardlycurved front endsof the links 37 have laterally-extending lugs 37, which are arranged toride against the cams 45 and 46 in the adjustment of the links to raiseand lower the back and to project the sliding member of the seat-frame.

The sliding member of the seat-frame is normally retracted, and the backis held in its raised position by means of a strong coiled spring 47,arranged in a horizontal longitudinal position below the seat-frame andto one side of the standard 6, the rear end of said coiled spring beingattached in a suitable manner to the base member 31, while the front endof said spring is attached to the hanger 48, fastened on the frontcross-railof the sliding member 32 of said seat-frame. To hold theseat-frame and back in their adj usted positions, I provide twospring-catches 48" 49, spaced at suitable intervals on and attached toone of the side rails of the sliding member of the seat-frame, and thesespringcatches 48 and 49 have spring-controlled bolts which are normallyforced below the sliding member of the seat-frame, and each catch isadapted to engage with a keeperplate 50, fastened to the frontcross-rail of the base member of the seat-frame. The catch 49 ispositioned at the front ofthe sliding member 32 to engage with thekeeper-plate when the back is raised and the sliding seatframe memberretracted; but when the back is lowered and the seat-frame memberextended the catch 48 engages with the keeperplate to hold the parts insaid adjusted position. A releasing device 51 is provided on the lowerside of the base member of said seat-frame, and said releasing devicehas a pintle or stud adapted to be lifted by hand and to engage witheither of the catches 48 or 49 for the purpose of freeing either catchfrom the keeper-plate and to permit the sliding seat-frame member andthe back to be adjusted as may be required.

The seat 55 is mounted upon the sliding member 32 of the seat-frame, soas to be carried therewith in its horizontal adjustment and to becapable of a limited vertical adjustment with relation to saidseat-frame. On the inside of the seat is provided a series ofangularly-slotted plates 56, and these plates are fastened securelywithin the seat near the corners thereof. Within this seat is arrangedparallel rails 57, which are fastened in a suitable way to the frame ofthe sliding member 32 of the seat-frame, and said rails are providedwith slotted keepers 58, which lie adjacent to the an gularly-slottedplates 56 on the seat. A seat-lock 59 is arranged within the seat 55 topass through the slotted guide-plates 58 and engage with the angularslotted plates 56 on the seat. As shown in the drawings, this seat-lockconsists of a central stem 59 and two cross-bars 59", attached to thecentral stem. These cross-bars of the seat-lock pass through the slottedplates 58 and fit in the angular slots of the seat-plates 56, and oneend of the? central stem 59 is extended through an aperture 60 in thefront rail of the sliding member 32 of the seatframe, said extended endof the stem being provided with a finger-knob 61 and with a coiledspring 62, said spring being seated at one end against the collar 61 andat its other end against the front rail of the sliding member of theseat-frame.

The tendency of the spring 62 is to draw the seat-lock into one or theother of the angular offsets in the plates 56; but the seatlock may bemoved longitudinally within the slotted plates 58 for the purpose'ofbringing the cross-bars 59 into the vertical members of the slots insaid plates 56, thus releasing the seat 55 from locked engagement withthe seat-lock 59 and permitting the seat 55 to be raised to its elevatedposition by the action of the coiled lifting-springs 63, said springsbeing attached at their upper ends to the seat 55 and fastened at theirlower ends to the frame of the slidable member 32 of the seatframe. Whenthe seat-lock is adjusted to have its cross-bars fit in the upperofisets of the angular slots in the plates 56, the seat 55 is held in adepressed locked position on the seat-frame; but the operator may movethe seat-lock longitudinally, so as to bring the ends of the cross-bars59 in the vertical parts of the slots in said plates 56, whichadjustment of the seat-lock permits the springs 63 to raise the seatabove the seat-frame, after which the seat-lock may be shoved back, sothat its cross-bars 59 will enter the lower 0&- sets in the annularslots of said plates 56, thereby locking the seat 55 in its raisedposition. To lower the seat 55, it is necessary to again adjust theseat-lock, press downwardly upon the seat 55 to place its springs undertension, and move the plates 56 so as to bring the upper offsets in theangular slots thereof in line with the ends of the seat-lock, afterwhich said lock may be pressed back to move its cross-bars into theupper offsets of the angular slots in said plates 56, thereby lookingthe seat 55 in its lowered or depressed position. The rails 57 and theslotted plates 58 serve to sustain the said lock in operative relationto the seat-frame and t0 the seat, and said slotted keepers 58 permit ofthe proper endwise adjustment of the seat-lock to enable the seat 55 tobe adjusted vertically, as may be required.

The operation of our improved chair will be described as follows: Toraise or lower the chair or stool, the operator moves theadjusting-lever 21 to bring its prong 22 into engagement with theadjusting-ratchet and turn levers 9 to retract the pawls 8 fromengagement with the serrated plates 26, after which the standard andseat may be raised or lowered vertically. The seat with the attachedback may be rotated freely in a horizontal plane on the standard and thespindle. With the sliding member of the frame retracted and the back ina raised position the structure is adapted to service as a chair tosupport the back of the operator occupying the chair, and the seat andback are held firmly in place by the strong coiled spring by one or theother of the locking devices 48 or 49 and by the links. To convert thestructure into a stool with two seats, the locking device 49 is releasedand the operator presses backwardly and downwardly on the back 34 andpulls outwardly on the front end of the sliding member of theseat-frame, whereby the links 37 are caused to slide in the channels orgrooves 44, and the lugs 37 on said links ride upon the cams 45 and 46on the central bridge-bar of the base member of said seat-frame,therebyguiding the links in their travel during the lowering or raising of theback 34. The back 34 is adapted to be lowered into a horizontal positionsubstantially flush with the seatframe 30, and during the loweringadjustment of the back the seat-frame member 32 is extended to projectbeyond the base member 31, and the spring is extended and put underincreased tension, said parts being held in their lowered and extendedpositions by the engagement of the catch 48 with the keeper-plate. Thestructure thus forms a stool provided with two seats, the seat 55 beingcarried by the extensible member of the seat-frame and the back 34forming the other seat of the stool. In case the structure is to be usedby two persons of different heights the seat 55 may be released byadjusting the seat-lock 59 and permitting the spring 63 to raise theseat to its elevated position, after which the seat-lock is engaged withthe angular slotted plates 56 to hold the seat steadily in place. Torestore the parts to their positions for service as a chair, the seat 55is forced down and locked in compact relation to the seat-frame, thecatch 48 is released, and the spring pulls the sliding member of theseat-frame inwardly, and the links raise the back to its normal positionsubstantially at right angles to the seatframe.

The members of the seat-frame 31 32 are slidablyconnected together andheld in their proper positions bymeans of long plates 32 and headedstuds or bolts 32. (Shown by Fig. 9.) The member 32 of the seat-framehas a longitudinal groove over which is secured the slotted plate 32",and to the member 31 of the seat-frame is attached the headed bolt orstud 32, which passes through the slot in the plate to have its headoccupy the groove in the seat-frame member 32, as shown.

"We are aware that changes in the form and proportion of parts and inthe details of construction may be made without departing from thespirit or sacrificing the advantages of our invention.

Having thus described the invention, what we claim is 1. In aconvertible chair and stool, the combination of an extensibleseat-frame, a back hinged to one member of the seat-frame, and meansoperatively connecting the hinged backto said extensible seat-frame,substantially as and for the purposes described.

2. In a convertible chair and stool, a sectional seat-frame consistingof a base member and an extensible member slidably fitted thereto, incombination with a back adjustably attached to the slidable member ofthe seat-frame, and operative connections between said adjustable backand sliding seatframe member to sustain the back in its loweredposition, substantially as and for the purposes described.

3. In a convertible chair and stool, the sectional seat-frame consistingof a base member and an extensible member slidably fitted thereto, incombination with a back hinged to the slidable member of the seat-frame,links operatively connected to the sliding seatframe member and to theslidable back, and an attaching-spring attached to the respectivemembers of the seat-frame, substantially as and for the purposesdescribed.

4. In a convertible chair and stool, a sectional seat-frame consistingof a base member provided with inclines or cams and an extensible memberslidingly fitted to the base member, in combination with an adjustableback hinged to the sliding member of the seatframe, and links slidablyattached to the adjustable back, connected with the sliding member ofthe seat-frame and provided with in g or lowering the back and extendingor retracting the slidable member of the seatframe, substantially as andfor the purposes described.

5. In a convertible chair and stool, a sectional seat-frame consistingof a base member and an extensible member slidably connected thereto,and locking devices forholding the slidable seat member in its retractedor projected positions, in combination with an adjustable back, andoperative connections between said adjustable back and the seatframe,substantially as and for the purposes described.

6. In a convertible chair and stool, the combination of a sectionalextensible seat-frame, an adjustable back, means for sustaining saidback in either its raised or lowered positions, and avertically-adjustable seat carried by one member of said sectionalseat-frame, substantially as and for the purposes described.

7. In a convertible chair and stool, the combination of a sectionalseat-frame having one member thereof slidably connected to the othermember, a vertically-adjustable seat carried by said slidable member ofthe seatframe, means for locking said seat in its raised or loweredpositions with relation to the seatframe, an adjustable back, and meansfor sustaining said adjustable back in either its raised or loweredpositions, substantiallyas and for the purposes set forth.

8. The combination with a seat-frame and a vertically-movable seat, ofthe angularlyslotted plates carried by said seat and provided withofisets at right angles to vertical slots in said plates, rails attachedto the seatframe and provided with slotted keepers, a seat-look havingbars fitted in the slotted keepers and engaging with theangularlyslotted plates, lifting-springs for raising the seat, and aholding device for the seat-lock, substantially as and for the purposesdescribed.

9. The combination with a seat-frame and a vertically-adjustable seatthereon, of fixed rails on the seat-frame, slotted keepers carried bysaid fixed rails, angularlyslotted plates rigidly attached to thevertically-adjust-able seat, a seat-lock having its crossbars fitted inthe keepers and the angularlyslotted plates and provided with a stemwhich protrudes beyond the seat-frame, and a spring to hold theseat-lock in engagement with the ofisets of the angularly-slottedplates, substantially as and for the purposes described.

10. In a convertible chair and stool, the combination with a standard,of a two-part seat-frame having one member mounted on the standard andits other member slidably fitted to said firstnamed member, a seat-backmounted for adjustment to lie in substantially the horizontal plane ofthe seat-frame, means for locking the sliding seat-frame in fixedrelation to the base member of the seat-frame, and means for sustainingthe adjustable seatback in its horizontal or upright positions,substantially as and for the purposes described.

11. In a convertible chair and stool, the combination of a standard, atwo-part seatframe, a hinged back, operative connections between thehinged back and one member of the seat-frame, and avertically-adjustable seat mounted on the member of the seatframe towhich the hinged back is connected, substantially as described.

12. The combination with a base, of a seatcarrying standard providedwith longitudinal channels, pivoted pawls within the channels, leversmounted on the standard within other channels thereof, a toothedadjuster connected loosely with said levers, and an adjusting-levernormally free from the toothed adjuster and adapted to engage therewithto turn the latter and move said levers to retract the pawls,substantially as and for the purposes described.

13. The combination with a base provided with holding-plates, of anangular non-rotatable standard fitted for vertical adjustment withinsaid base, holding-pawls pivoted to the standard and arranged to engagewith said hold ing-plates of the base, vertical levers fulcrum'ed to thestandard and pivoted to said holdingpawls, a toothed adjuster looselymounted on the standard and having pivotal connections with said levers,and a springcontrolled adjusting-lever arranged to benormally free fromengagement with the toothed adjuster and having a prong which may be 3our own we have hereto affixed our signatures in the presence 0t twowitnesses.

thrown into engagement with said adjuster, for the purposes describedsubstantially as set forth.

14. The combination with a base having a lifting-spring and toothedholding-plates, of

a seat-frame, a non-rotatable vertically-adjustable standard fitted insaid base, a spindle passing through the standard and pivoted to theseat-frame, a casting having a clip at- 1 a vertically-adj ustable seat,the plates having the vertical slots thereof provided with 0&- sets andcarried by the seat-frame, a seat-lock independent of the seat properand slidingly confined on the seat-frame to normally lie in thehorizontal plane thereof and engaging with said angularly-slotted platesto sustain the seat in its raised or lowered position, and aholding-spring fitted against the seat-lock and the seat-frame,substantially as and for the purposes described.

16. The combination with a chambered base, and a vertically-adjustableseat-carrying standard, of the ratchet-teeth disposed in the base onopposite sides of the standard,

the oppositely-acting pawls fitted on the standard to engage with theratchet-teeth, the levers arranged longitudinally of the standard,fulcrumed thereto, and connected at their lower ends to-the pawls, apawl-adjuster pivoted on the standard and connected to the pawl-ad justin g levers, and means for actuating said pawl-adjuster,substantially as described.

In testimony that we claimthe foregoing as LEROY HALL ROBY. GILES CARLROBY.

Witnesses:

NELLiE (J. BEOKWITH, W. F. BoLEY.

